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System Description NHEC1320 COOLING FAN CONTROL NHEC1320S01 Sensor Input Signal to ECM ECM func- tion Actuator Wheel sensor Vehicle speed Cooling fan Cooling fan relay(s) Engine coolant temperature sensor Engine coolant temperature Air conditioner switch Air conditioner ON signal Ignition switch Start signal Refrigerant pressure sensor Refrigerant pressure The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refriger- OPERATION NHEC1320S02 SEC005E CONSULT-II Reference Value in Data Monitor NHEC1321 Specification data are reference values. MONITOR ITEM CONDITION SPECIFICATION AIR COND SIG I Engine: After warming up, idle Air conditioner switch: OFF OFF Air conditioner switch: ON ON GI MA EM LC FE AT AX SU BR ST RS BT HA SC EL IDX DTC P1217 ENGINE OVER TEMPERATURE System Description EC-517 |